We can't imagine the pain Nick Cave and his family are dealing with right now.

Almost four months after Nick's 15-year-old son Arthur Cave died in a tragic and terrifying fall, investigators have concluded the teenager ingested the hallucinogenic drug LSD shortly before his passing.

The revelation provides some closure to Arthur's loved ones who wondered why he'd walk off a dangerous cliff. One official explained:

"It's clear he could not know what was real and what was not real. It's completely impossible to know what was in Arthur's mind and what he was seeing. In Arthur's case, sadly, and I think mercifully, it was clear that he was not aware of what was going on," Ransom said. "The point of impact was the point of death."

So tragic and senseless. It's sad to know that one decision affected Cave's life in such a profound and final way.

During the inquest, Nick and his wife Susie Cave periodically had to leave the hearing during moments when graphic testimony about their son's death was revealed. Obviously, the "accidental" fall left Arthur with severe injuries.

In a heartbreaking post earlier this year, Arthur's mom posted the following throwback in the wake of her son's death. Take a look at the emotional message (below):